Autonomous Prediction of GPS and GLONASS Satellite Orbits

Mari Seppanen, Juha Ala-Luhtala, Robert Piche, Simo Martikainen and Simo Ali-Loytty

Peer Reviewed

Abstract:	A method to predict satellite orbits in a stand-alone consumer-grade GNSS navigation device is presented. The motivation for this work was to reduce the startup time of a navigation device without the use of network assistance. The presented orbit prediction method works for both GPS and GLONASS, achieving median accuracies of 58 and 23m in satellite position, respectively, for prediction up to four days ahead. A simple method for prediction of the satellite’s clock offsets is also discussed. A basic analysis indicates that the method gives a line of sight range error of 15 m, for both GPS and GLONASS, with most of the error due to the clock offset prediction.
Published in:	NAVIGATION: Journal of the Institute of Navigation, Volume 59, Number 2
Pages:	119 - 134
Cite this article:	Export Citation https://doi.org/10.1002/navi.10
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